Apparatus for making dental castings.



Cys. GARLBBRG @L T. E. RYAN.

APPARATUS FOB. MAKING DENTAL CASTNGS.

APPLICATION FILED MAR 26,1908.

949,391. Patented Feb. 15, 1910` C. S. GARLBERG & T. E. RYAN. APPARATUSrou MAKING DENTAL CASTINGS.

APPLICATION FILED MAB 26, 1908. 949,891 Patented Feb. 15, 1910.

2 SHEBTtP-HEBT 2.

A. MQNN) UNITED STATES ATEN T FFICE.

CARL SAMUEL CARLBERG AND THEODOR E. RYAN, 0F MINNEAPOLIS, MINNESOTA.

APPARATUS FOR-MAKING DENTAL CASTINGS.

Specification of Letters Patent.

Patented Feb. 15, 19,10.

Application filed March 26, 1908. Serial No. 423,442.

a machine wherein a gold inlay for a tooth Iillin can be easily andquickly cast.

A urther object is to provide an apparatus whereinl a casting onporcelain may be performed without danger. of checking or otherwisedamaging the porcelain.

Other objects of the invention will appear from the following detaileddescription.

The invention consists generally in various constructions andcombinations, all as.

hereinafter described and particularly pointed out in the claims.

In the accompanying drawings, forming part of this specication, Figure lis a vertical sectional view of a dentalv cast-ing machine embodying ourinvention. Fig. 2 is an end elevation. Fig. 3 is a detail sectional viewthrough the top of the oven and a flask thereon, and the .verticallyimoving head above the liask. Fig. 4 is a detail view of the top of anoven illustrating the means for supporting the flask during theoperation of filling itwith the investment material. F ig. 5 is a detailsectional View illustrating the means employed for forming the passageleading to the mold in the investment material. Figs. 6 and 7 illustratecaps of different form used in the bottomv of the flask.

In the drawing, 2 representsan oven supported upon suitable legs 3 andhaving a door 4. lVithin the oven is a grating 5 through which a burner6 extends, said burner communicating with a nipple 7 to` which a gaspipe may be attached. The top of the oven has openings 8 therein overwhich the flasks are placed, and the wall'pf the oven has a'horizontalslot 9 thereinleading from the4 door opening to receive a lia-'ndle 10provided on the flask 11, said slot allowing the iask'to be placed inthe oven for drying purposes, and. the door closed leavinguthehandleprojecting outwardly through the slot. On'the rear of the oven a socketl2 is provided and ada ted to receive the lower end of a goose necstandard 13, said standard being capable of revolution in its socket andheld in place therein by a bolt 14 fitting within 'an annular groove 15in said standard., A langer 16 is vertically slidable in the standard 13and a lever' 17 is pivoted at one end on said standard and normally heldin its raised position by a sprin 18, and a rod 19 is plvotally connecteat one end to the plunger 16 and has a loose connection at its other endwith the lever 17, whereby when the lever is depressed the plunger willbe forced downward. The lower end oisaid plunger is provided with apassage 2O and a nozzle 21 is arranged concentrically in said passageand spaced from the walls thereof and provided with a duct 22. Saidnozzle extends below the lower end of the plunger and is tapered at itsdischarge end. A sleeve 23 is mounted on the plunger and connnunicateswith the passage 20,'and a valve 24 has a seat 25 in said sleeve and 'isadapted to close the entrance to said passage.

A gas connection 26 leads into the sleeve 23 and the stem 27 of thevalve projects through a cap 28 provided on the end of said sleeve. Arod 29 is mounted in lugs 3() on the plunger and carries an arm 3l inwhich a screw 32 is supported, said screw having a head adapted to begrasped by the lingers, and its inner end engaging the stem ofthe valve24 and forcing it open against the tension of the spring' 33. When thisscrew is operated and the ,valve 2l opened gas will flow freely throughthe pipe 26 mto the passage 20 and from thence downward to a burner 34provided in a disk 35 that is mounted on the-lower end of the plunger.The rod 29 is capable of rocking in its support and the spring 36normally tends to hold the arm 3l 1n position to bring the operatingscrew in line with the stern of the valve 24, so that when the saidscrew is moved the valve will be opened. A finger 37 having a camSurface 3S thereon is mounted on the rod 29 and a-trip rod 39 isadjnstably mounted on a post -l-O and adapted to engage the cam surface.3S and rock the rod 29 when the plunger has descended a predetermineddistance for the purpose of disengaging the screw 32 from the Valve stemand allowing the valve I adapted foruse 'with one pattern having av 4former 46. We

f sensei l i vdownward to move the disk 3:54 into engage nient with thetop of' the desir.

.The disk 35 has-al pad el providedy with 4an opening through. whichtlie llame 'from the burner is projected against 'the metal in the topVof the-flask. AThe flask is filled with suitable yinvestment materialindicated by reference 42, the'wax lpaottern being embedlded-1n theinvestment with a sprue-former leadingfrom the pattern to the Crucibled3 rial. This depression'or crucible in the investment material ispreferably formed by means of al cap or cover that 1s placed in vthebottomof the 'la'slr'preparatory to lilling it.. laps orcovers ofvarious shapes and sizes may lloe provided according to the size of theflask and the numberof castings that it 'is desired to produce at onetime.

ln Fig. 6. we have illustrated a cap del single lholea therein vfor apin orl spruev rovide one pin for each pattern, the pointed end of thepin being inserted into the wax bearing the impression of the cavity andthe pattern thus obtained is embedded in the investment material in theusual way of molding dental castings. A plate 47 Vispivoted at d8 and isadapted to supportthe flask andv has a series of holes 49 through whichthe pins of the sprueformer are inserted. A bracket 50 is provided onthe underside of the plate .4:7 and a screw 51 is carried by Vsaidbracket and has -a cap 52 on its upper end upon which the pins 4G rest.The cap 52 is guided vertically and held against rotary movement by aguide pin53. By operatingthe screw 5l desk. is placed on the plate 4tthe wax' the cap 52 may be raised and lowered and the pins lo and thepatterns carried thereby adjusted to the desired elevation in the flask.

ln Fig. l a cap 5d is illustrated having a series of holes therein toreceive the sprueformer pins and support a series of patterns to enablea number of castings to oe produced lat the same time. A cover plate 55is pivoted on the oven top and adapted to swing in over the openings '8therein and close them.l The duct 22 communicates at its upper end witha sleeve 56 having a cap 57 thereon wherein a stem 58 is threaded,

the inner end of' said stem having ya valve 59 that vis adapted to closethe passage 22. l An air inlet pipe 60'communicates :with the sleeve 56,the pressure being supplied from -a tank or by means of a suitable pump..ily the adjustment of the valve 59 the volume of air admitted to thenozzle is controlled. l

ln the operation ofvv tbe ap aratus the pattern having' been obtained,and .if only one casting is to be made a .single pin is .moverent ollisaid movable burner.

thrust up through a hole in the plate and into the pattern. 'lheinvestment material is then paclredl around the pattern and upon thecover inclosed by the flask and through which the pattern supporting'pin is thrust. After the investment material has been packed solidlyaround the pattern the liaslr is lifted and inverted, the pin beingdrawn out of the pattern lea-ving a passagey from the bottom of thedepression or-cavityv in the investment material' leadingl to the iatterri. y oven., and the gold for the 4casting laid in the depressionor crucible formed in the top of the investment material. lHeat isapplied from above and below in the man'- ner heretofore described, the,wax pattern volatilized and the gold reduced to a molten condition.dlfhen this has been done the lever l? is operated to depress the.lplunger and seat the dislr on the aslr and air pressureis admitted tothe nozzle bythe open. ing of the valve 59, whereupon. the -:molten Theiiasl; is then placed on the gold in the Crucible will be forced downthrougl'i the passa -e in the investment material into the molt..

We have vfound that by means ofthisA apparatus an intense, uniform heatcan be and that a cast-ing on porcelain vmay be made without danger ofchecking-or otherwise damaging the porcelain. `During the operationof'casting, one or moreflasks with freshly packed investment materialtherein may be placed in the oven fordrying l'purposes preparatory toforming a casting.

life claim as our :invention:

l. The lcombination, with a stationary' burner and a flask support, of amovable burner between which and said stationary burner a mold flask isplaced upon said support, said' movable burner having a part to restupon the top of said flask, and a pipe connection for a gas supplythereto, a Huid pressure nozzle provided within said Inovable burner anda valve controlling the admission of duid pressure to said nozzle for'manually operated means for opening said valve and means forautomatically tripping said opening means to allow said valve to closeand shut olf the supply of gas at a predetermined point in the downwardwith a sta ionary suppertingl a flask vertically movable connection for'de 8. i comloin'ation, burns and means :for above the same, of a burnera pine vdirected against* the Hasi; and its contents,

livcring gas thereto, a spring-pressed valve normally closing thepassage to said burner, a plunger whereon said burner is supported, anoscillating arm carried by said plunger, means mounted in 'said arm andadapted to engage said valve to hold it in its open position, and meansfor moving said arm to release said valve and allow it to close whensaid plunger has reached a predetermined point in its descent.

Jr. In a machine of the class described, the combination, with areciprocating plunger, of a burner carried thereby having a gas, pipeconnection and a valve normally clos- `ing the passage to said buiner,manually operated means for -locking said valve in its open position toadmit gas to said burner, and means arranged during the descent of saidplunger to automatically trip said locking means, and means whereby thetime of said tripping operation may be varied, for the purposespecified.

5. The combination, in a machine of the class described, with areciprocating plunger, ot' a burner mounted thereon and having a passageleading thereto and a gas connection and a valve for regulatinf theentrance of gas to said burner, a nozzlne mounted in said plunger andalso having a passageand a fluid pressure connection, and means forregulating the entrance of fluid pressure to said nozzle.

6. The combination, with a reciprocating plunger, of a disk carriedthereby, a burner provided in the lower end of said noazle and having anopening through said disk, and a-passage communicating with the gassupply, and a valve normally closing said passage, a nozzle concentricwith said burner and also having a passage leading to a Source .of fluidpressure, and a valve for regulating the admission of said pressure,means for temporarily opening said gas valve and means actuated by thedescent of said plunger for tripping said opening means to allow saidvalve to close aut'omatieally and shut oftl the entrance of gas to saidbuiner at a predetermined point in the stroke of' the plunger.

7. In a machine of the class described, the combination, with an ovenhaving a stationary burner in the bottom thereof, a door for said oventhrough which a molding flask may be inserted, the wall of said ovenhaving a slot'eommunicating with the door opening and adapted' torece1ve t1ie handle or the molding flask and permit the oven door to beclosed.

8. The combination, with. a stationary burner and means for supporting amolding flask above the same, of a vertically movable burner having apart to engage and close the top of the flask, a pipe connection andvalve for said burner, a nozzle carried by said burner and connectedwith a source of fluid pressure, a fluid pressure valve, a lever devicefor depressing said burne and meehanism actuated by the movement of saidllever for closing said burner valve and opening said fluid pressurevalve at a. predetermined point in the descent of said burnei'.

9. The combination, yburner and a flask support, of a vertically movabledisk adapted to contact with and close the top of the flask, a burnercarried by said disk and connected with a source of gas supply andhaving a suitable controlling valve mechanism for moving said disk-intoengagement witlrthe top of said flask, and means for automaticallyshutting oftl the supply ot gas to said burner at a prede- .terminedpoint in the descent of said disk.

10. The combination with a base having a flask support, of a verticallymoving plunger', a disk mounted thereon and adapted to cngagc and closethe top of a flask resting upon said support, a burner carried by saiddisk and connected with a source of gas supply and having a controllingvalve and mechanism 'for moving said disk into engagement with the topof the flask.

11. The combination, with a base' having a flask support, of aIrotatable standard mounted on said base and overhanging said support, aplunger vertically slidable in said standard, a disk mounted thereon,and adapted to engage and close the top of a flask 4resting upon saidsupport, a burner carried by said disk connected with a source of gassupply and having a controlling valve an mechanism for moving said diskinto cngageinent with the top of a flask.

l2. The combination, with a base and a flask support thereon, of astandard overhanging said support, a plunger vertically movable in saidstandard, a disk carried by said plunger and adapted to engage the topof a flask resting on said support, a fluid pressure now/,le carried bysaid plungerI and connected with a source of fluid pressure supply andhaving a controlling valve, mechanism for depressing said plunger andmeans for opening said valve at a prei-lotermined point in the descentof' said plunger and disk.

13. In a machine of the class described, the combination with a plunger,of a burner having a gas pipe connection and a controlling' valvetherefor, means arranged during the descent o t' said plunger forautomatically opening said valve and means whereby the time of operationof said valveanay be varied, for the purpose specified. y

1-1. The comliination with the investment ring, of a burner, means -t'orsupporting the ring directly above the burner, and means for applyingpressure to the contents of the ring, said means comprising an inverted,cup-shaped receptacle adapted to engage with a stationaryabove theinvestment ring, and provided with :1 lining of absorbentninieriai forthe purpose setforh. f

' 15. The combination with the investment ring, of a burner below thering, means for pplying. pressure to the contents of the ring, saidmeans comprising s, closure for the top of the ring and provided with e1in: ing of absorbeni materiai, for the purpose set forth.

l 16, In n machine, of the class descrihed,. a disk adapted to close thetop of the flask,

u vhurner carried by said disk, a fluid pres surenozzie concentric withsaid burner, and means connecting" said burner and nozzle with a sourceof gas land' uid pressure supply. Y

1T. In a machine of lthe class described, a disk adapted to close thetop of the Hash, a burner carried hy said disk and connected with ssource of gas supply7 a iuid pressure @meer nectedwith s source of gassupply sind newi regulating valve, snozzle also carriedY ing' e by seiddisk and connected Witha sourceof fluid pressure supply and also havingacontrohng Valve and means for' closing said gas' supply valve andopening said uid pressure valve during the descent 'of said d1sk,substantially as described.

in witnessvhereof, We have hereunto set our hands this lth day of March1908. CARL SAMUEL GARLBERG. THROUGH E. RYAN.. Witnesses RICHARD PAUL, J.A. BHNGTON.

